Bezier Curve - matrix operation and curve splitting
Building a cubic Bézier polynom 4 Points Ai=(xi,yi), i=1...4, in Graphics have to be converted in a 4x2 matrix Ai in CAS to multpliy with Basis T and Bézier Matrix B3.
So that the matrix result can be represented graphically, it must be written as a point/vector curve b1_s(t).
The same in splitting and elevating curve points.
The point matrices QA1j, Q'A2j, MAi are erpresented in graphics by pointsQA1j, pointsQ'A2j, pointsMAi.
Scripting extracts the free points in graphics for interaction.
